exhaust drone/harmonic resonance

Here is what I have. Stock exhaust manifolds (70 340) TTI down pipes, TTI X pipe, Had dynomax super turbos took them off and tried spintech sportman 3000. TTI over the axle tail pipes and TTI tips. The car sounds great from the outside. But inside it hurts your ears annoying resonating just want to jump out kind of noise. I talked to Ron at spintech and he suggested trying resonators in the tail pipe area. There doesn't seem to be enough room. Has anybody had any luck with this? I have way too much money invested in this to give up on it, any ideas would be appreciated.

I feel you pain both in ears and pocket book.